If you can get a screenshot I like to see this , also download from Galaxy app store Nice catch maybe it can tell us moreDon't know what is triggering this. It happens when I double-tap my S10+ when idle, and this message is displayed at the top of the lock screen, in small type size. Very weird. It is not a well-formatted error message, it looks more like a message not meant for users to see.
I did a bit of research and there's not much on this topic on the 'net.
It almost sounds like an app is running the background and you are interrupting it when you wake the phone. Try starting the phone in Safe Mode and see if you still get the error. If you do that would seem to point to an actual system error. If you do not, that would point to an app. If it points to an app you can try to narrow it down by looking at your app usage, see if anything odd jumps out at you. Since it's not an ad or anything like that it may be difficult to pinpoint, but this will give you someplace to start. If it points to the system, you can try a partition cache wipe.
If it's similar to the one in your link i think I've seen that before in previous Samsung devicesI will certainly get a screenshot next time I see this.
Although rare, this issue has surfaced before. Here's a detailed report.